for the beginning we thought a cloud based solution is ok. And I knew VB from before, but never had to do with VB5.
BUT: VB cloud is buggy like hell and very unreliable.
So next step will be: Migrating to xenForo.
But first Issue there: how can we import the VB cloud-Data? Obviously VB5 isnt suported by the built-in importers... That seems to be a showstopper.